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For review:

- setenv(): use secure _putenv_s() declared in msvc >= 2005 (recommended and 
apparently also used by Qt4/win); return -1 when name==0;

- unsetenv(): clear the variable using setenv(name, 0, 1) as environ is 
deprecated.

-- 
regards / pozdrawiam, Jaroslaw Staniek
  Sponsored by OpenOffice Polska (http://www.openoffice.com.pl/en) to work on
  Kexi & KOffice (http://www.kexi.pl/en, http://www.koffice.org/kexi)
  KDE Libraries for MS Windows (http://windows.kde.org)

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